Question on stroking a K model

Is it necessary to move the upper rear case bolt hole further to the rear as per the KH to allow for clearancing of the rods? When I put the K case next to the KH case it seems like there won't be much left of the K case if I clearance as much as the KH has. I would like to use either the KH or 4 5/8 stroke options.

Hi Suicideshovel...

Hum, don't know!!! Knew K and KH cases have some differences but assumed it was to do with longer cylinder studs on the KH... Just had a look at the parts books, shows drgs of K cases most probably and I can see what you're saying... Yes, KH do have case and cylinder deep reliefs for the longer stroke... I used to have KK and KHK together at the same time in the garage, but never both at the same time in bits!!! Learn something everyday, the only way to keep young at heart!!!

Patrick

Thanks Patrick - actually nevermind, it is clear from my own inspection of the cases that it would need to be done IMO.

Next question: out of curiosity does anyone have the figures of how much a set of -52 K model flywheel and shafts weighs compares to a set of stock -57 sportster items? Given parts availability I will likely be going with the sportster items as I have them on hand.

A KK and a KHK in the one garage...nice!

there was thread quite recently about crank assembly weights

Hi 45Brit, I have followed that thread with interest although it doesn't list the info I need.

It is interesting to see that to comply with my understanding of C-class regulations one would have to run a K, KR, or de-stroked KH/KHK? I would imagine the KR & KH/KHK from late-54 onwards being the more logical choice due to trapdoor configuration. There were no trapdoor K model cases that I know of, unless restamped raplacement cases.

I can only assume the later model KRs that came out after the introduction of the KH used KH style trap door cases. Makes gear box ratio changes much easier!

Yes, they did - it certainly seems the easier thing for maintenance.